Based on the values alone, a heart rate of 50 beats/minute is below the lower end of the normal range. The normal adult heart rate range is 60 to 100 beats/minute in quiet, awake conditions, slower in the elderly, slightly faster in women, and faster in children. Any adult with a heart rate below 60 beats per minute is called bradycardia, and more than 150 beats per minute is called tachycardia. Tachycardia and bradycardia can be transient or persistent and can be caused by a variety of physiologic, pathologic, or pharmacologic factors. Physiologic bradycardia is seen mainly in the elderly and in people who exercise heavily for long periods of time. It can be left untreated. Pathologic causes, such as hypothyroidism when the heart rate is slowed, cardiac diseases, such as arrhythmia in sinus bradycardia, sick sinus node syndrome, etc. can appear slow heart rate. Drug-induced heart rate slowing, mostly seen in taking too much of the drugs that can cause heart rate slowing, such as β-blockers, morphine, digitalis poisoning, etc., can cause heart rate slowing, with the drug metabolized in the body completely, the heart rate can return to normal. In order to exclude the slow heart rate caused by pathologic diseases, it is recommended to consult the cardiology department, consult the specialist’s opinion, and do a reasonable examination, so as to achieve early detection and early treatment of the disease.